Myelodysplastic syndrome (MDS) is a group of origin of hematopoietic stem/progenitor cells of myeloid clonal disorders.Studies have shown that MDS patients are with varying degrees of abnormal iron metabolism in the course of diagnosis and supportive care.Iron overload can damage the body's iron balance.Excess free iron can sink in plasma and tissue,especially in the body's major organs such as heart,liver and endocrine gland,resulting in structural damage and organ dysfunction,accelerating transformation to acute myeloid leukemia,and increasing the death rate.Iron chelation can improve the prognosis of patients,prolong overall survival and leukemia-free survival.The mechanism of iron overload in MDS research will be described in this paper.

Objective To analysis the effect of vitamin, folic acid combined with Ginkgo biloba extract on cognitive function in elderly patients with stroke.Methods 56 patients who were diagnosed with acute cerebral infarction were collected.All patients were randomly divided into experimental group and control group, 28 cases in each group.Control group was given conventional treatment for improving circulation, nutrition brain cells, anti platelet aggregation, experimental group was given vitamin B6 tablets(20 mg,one time per day), folic acid tablets(20 mg, one time per day) and Ginkgo Biloba Extract Tablets(80mg, two times per day) on the basis of conventional treatment.After treatment, the levels of plasma Hcy, serum BDNF, UCP2 level and cognitive function were detected in all patients.ResuIts After treatment, compared with control group, the plasma Hcy level was significantly lower in experimental group(P<0.05).The serum BDNF level in experimental group was significantly higher (P<0.05) .The serum UCP2 level in experimental group was significantly higher (P<0.05) .The MMSE and MoCA scores of the patients in the experimental group were significantly higher (P<0.05).ConcIusions Vitamin, folic acid combined with Ginkgo biloba extract can reduce the level of plasma Hcy in elderly patients with stroke, improve serum BDNF, UCP2 levels, improve the cognitive function.

Cancer stem cells are defined as the unique subpopulation in the tumors that possess the abili-ty to initiate tumor growth and sustain self-renewal as well as metastatic potential.Accumulating evidences in recent years strongly indicate the existence of cancer stem cells in solid tumors of a wide variety of organs.In recent years,many cancer stem cells have been found,including leukemia,breast cancer,brain ttunor,liv-er cancer,colon carcinoma,etc.In this review,we will discuss the conception and origin of the gastric cancer stem cells,and their role in the development of multi-drug resistance.

Objective To study the risk factors of central lymph node (CLN) metastasis in papillary thyroid carcinoma (PTC),to provide the basis for clinical treatment.Methods A total of 407 patients with PTC in thyroid surgery,the Third Affiliated Hospital of Harbin Medical University from January 2010 to June 2012 who had undergone at least ipsilateral CLN were studied.These factors included normal situation,thyroidglobulin antibody or thyroid microsomal antibody,family history,pathological features (the size of primary,tumor multifocal,tumor location and capsular invasion),TNM staging and CLN metastasis.Univariate analysis and multivariate analysis were performed using x2 test and binary Logistic regression test,respectively.Results The CLN metastasis rate was 51.351％ (209/407) of the 407 patients with PTC.The CLN metastasis was significantly associated with age,tumor multifocal,the size of primary tumor,capsular invasion and TNM (x2 =21.080,14.974,47.671,12.858,8.765,all P ＜ 0.01).Sex,thyroid globulin antibody or thyroid microsomal antibody,family history and tumor location were not associated with CLN metastasis (x2 =1.457,1.106,0.000,0.260,all P ＞ 0.05).Multivariate analysis indicated that age (＜ 45 year),the size of primary tumor (≥ 1.0 cm),tumor-muhifocal,and TNM (T3 + T4) were the independent risk factors for CLN metastasis [odds ratio (OR) =0.937,2.347,0.380,0.389,all P ＜ 0.01].Conclusions Age (＜ 45 year),the size of primary tumor (≥ 1.0 cm),tumor-multifocal and TNM (T3 + T4) are risk factors for CLN metastasis in PTC.Dissection of CLN should be considered for PTC patients with these factors.

The baculoviral inhibitors of apoptosis play a significant role in infectivity and viral host-range, which make them potential candidates for the engineering and improvement of baculovirus insecticidal. The iap3 gene of Spodoptera exigua nucleopolyhedrovirus (SeMNPV), amplified by PCR, was 939 bp encoding IAP3. The PCR product was cloned into EcoR I/Bam H I of the plasmid pEGFP-C1. GFP was fused to the N-terminaus of IAP3 to study distribution in HEK293. It was observed that the plasmid expressing IAP3 significantly inhibited apoptosis induced by cisplatin in HEK293 cells. We conclude that the IAP3 of SeMNPV is functional in mammalian cells.

Purpose　The aim is to study the transduction of m urine stem cell factor(SCF) into umbilical blood cells by LipofectinRMmediated and expression in them.Methods　Murine SCF cDNA encoding extra cellu lar domain was isolated using PCR from plasmid pRC/CMV(containing SCF gene), and then recombined into the expression vector pcDNA3,and transferred into enrichme nt cultural umbilical blood cells. Semi-quantitative RT-PCR was used to examin e the expression on mRNA level.And the effects of supernatant of transfected umb ilical blood cells were investigated alone or in coordinate with GM-CSF by colo ny formation test of human bone marrow cells in semisolid culture.Results 　SCF mRNA was expressed in transfected umbilical blood cells.The su pernat ant of transfected umbilical blood cells could increase the number of CFU-GM, s ynergizing with GM-CSF.Conclusion　The supernatant of umbil ical b lood cells transfected with vector containing mSCF gene can stimulate the colony formation of human bone marrow cells in combination with GM-CSF.

Objective To investitgate the level of polychlorinated biphenyls in retail livestock meat.Methods Totally 28 samples of three kinds of meat including of beef,pork and mutton were collected during Aug-Dec.,2008.Twelve dioxin-like polychlorinated biphenyls(DL-PCBs) and six marker PCBs were extracted by Soxhlet extractor,cleaned up by FMS and qualitative and quantitative analyzedsis by isotope dilution high-resolution gas chromatography/high resolution mass spectrometry(HRGC/ HRMS).Results Levels of total 18 compounds including of 12 DL-PCBs and indicator PCBs in beef,pork and mutton were 1 607.60 pg/g fat,435.82 pg/ g fat,and 505.17 pg/g fat respectively,DL-PCBs concentration were 456.19 pg/g fat,46.37 pg/g fat and 77.50 pg/g fat respectively.Maker-PCBs concentration were 1 151.41 pg/g fat,389.45pg/g fat and 427.67 pg/g fat respectively.The levels of PCB toxicity equivalent(TEQ)(the median value)were:0.84 pg/g fat in beef,0.15 pg/g fat in pork,0.28 pg/g fat in mutton respectively.The TEQ concentration of PCB(median value) was lower than the EU action level limit value.In all samples,PCB118 was the greatest contributor to the total contaminated concentration,and PCB126 was the dominant contributor to toxicity equivalent(TEQ).Six of 28 samples exceeded the limit value of the EU action level.Conclusion The results show that PCBs contamination exists in a city from the six samples exceeding the EU standard limit.It should take measures to explore the cause of contamination of PCBs compounds and control the pollution in order to guarantee food safety effectively.

Tethered cord syndrome is a severe and congenital disease. Resecting the diseased ilium terminal(FT), eystis, lipoma is the main treatment for the disease, relieving the injury to the eonus medullaris. Why the FT is diseased and thickened? Is it necessary to eut internal FT or external FT? What is the injury mechanism of the low-positional or normal positional oonus medullaris? To study the component and structure of the conus medullaris and FT may give definite answers.

Objective To explore the clinical features and diagnosis of pulmonary sarcoidosis.Methods The data of 60 cases of pulmonary sarcoidosis confirmed by pathology was reviewed to determine the clinical features and the value in the diagnosis of sarcoidosis.Results The main clinical manifestations of sarcoidosis included bilateral hilar and mediastinal lymphadenopathy.The results of lung function tests showed that these patients had restrictive ventilating obstacles with decreased DLCO.The diagnosis was confirmed in 80% of the bronchial mucosa biopsies and 77.8% of the transbranchial lung biopsies through fiberotic bronchoscopy,87% of the biopsies of peripheral lymphnodes and 87.5% of the subskin nodes biopsies.Conclusion Nonspecific constitutional symptoms may occur in the cases of sarcoidosis.To the diagnosis of intrathoracic sarcoidosis,peripheral lymph nodes biopsies,the bronchical mucosa biopsies and TBLB are the convenient methods with highly definite diagnosis rate and microinvasion in clinical practice.

Objective To evaluate the effect of duration of subcutaneous injection on the extent of bruising at injection sites among patients receiving low- molecular weight heparin. Methods Randomized clinical trials and quasi-experimental within-subject design that assessed the effect of subcutaneous duration on the bruising of injection sites were selected in Cochrane library, JBI evidence-based practice medical and nursing database, PubMed biomedical information retrieval platform, Medline general medical literature retrieval database. RevMan5.3 software was used to analyze the data after quality assessment, and data extraction were made for eligible trials. Results A total of 9 trials were included. The results of Meta-analysis supported the 30 s duration injection technique on reducing the rate of bruising of injection sites than 10 s duration injection technique (odds ratio was 0.34,95%confidence interval 0.25-0.47, P<0.01).While it was failed to support the effect on reducing the bruising area 48 and 72 hours after injection (P > 0.05). Conclusions Increasing the length of low-molecular weight heparin subcutaneous injection can reduce the rate of bruising. While it could not effectively reduce the area.